The third mirror makes in an inverse of the image from the second mirror, returning it to its original configuration. The second mirror produces an image that is the inverse of the first. A simple way to make a retroreflector is to form a corner reflector, with three mirrors faced mutually perpendicular to each other. In retroreflection, light returns in the direction from whence it came. In reality, images aren't truly infinite because tiny imperfections in the mirror surface eventually propagate and extinguish the image. If a square is formed with four mirrors face to face, the infinite images appear to be arranged within a plane. If two mirrors are placed facing each other and parallel to each other, infinite images are formed along the straight line. In diffuse reflection, light is scattered in multiple directions because of tiny irregularities in the surface of the medium. Waves can also strike non-shiny surfaces, which produce diffuse reflections. Specular reflection from curved surfaces may be magnified or demagnified, depending on whether the surface is spherical or parabolic. Specular reflection from a flat surface forms mirror mages, which appear to be reversed from left to right. Let us try to draw a ray diagram to understand the problem.The law of reflection works for specular surfaces, which means surfaces which are shiny or mirror-like. Q8(*): At what value of the angle of incident α1 is a beam of light reflected from the surface of water perpendicular to the refracted beam? Assume n is the refractive index of the refracting medium. Since image is real, we can assume it is a convex lens. Let u be the object distance, the image distance will be v = 1-u Q7: What is the focal length of a lens that produces a real image three times as large as the object if the distance between image and object is 1.0m? The magnitude of m (magnification) is less than one, thus image formed is of reduced size. The -ve sign of m tells that the image is inverted.
The image is real (+ve v) and is formed on the other side of the lens. Q6: A converging lens has a focal length of 15cm. (You may have seen this effect in barber shops). Where θ is the angle between the mirrors and N is the number of images formed. You may follow the link on multiple reflections to see more such images.įor two mirrors placed at any angle, the number of images formed by the mirrors can be determined by: You may see practically as shown in the figure. Q5: How many images will you see when two plane mirrors are perpendicular to each other? Therefore, the child and her image comes closer to each other by 0.40m per second. In the same second, her image also moves 0.20m closer. Q4: If a child crawls towards a mirror at a rate of 0.20 m/s, then at what speed will the child and her image come nearby to each other?Īns: In 1 sec, the child moves towards the mirror by a distance of 0.20 meters.
Refractive index n = sin i/sin r = sin 30/sin 19
Q3: If the angle of incidence of a ray of light falling on the glass surface is 30° and the angle of refraction is 19°. Q2:When a bright object is placed 10 cm away from a concave mirror, its real image is formed at a distance 40cm from the mirror.
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